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Steel Making

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Corrosion
This steel like any other steel when distorted by cold worki...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Furnace Data
In order to give definite information concerning furnaces, fu...

The Forging Of Steel
So much depends upon the forging of steel that this operation...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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